From: Mihai Bazon <mihai@bazon.net>
Date: Fri, 8 Nov 2013 09:57:17 +0000 (+0200)
Subject: Only descend twice after drop_unused if it's the same node type.
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=7d11b96f48f7f03727fa664d540484f214cadca2;p=UglifyJS.git

Only descend twice after drop_unused if it's the same node type.

Fix #345
---

diff --git a/lib/compress.js b/lib/compress.js
index f44277cd..c60ee19e 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -85,13 +85,14 @@ merge(Compressor.prototype, {
     },
     before: function(node, descend, in_list) {
         if (node._squeezed) return node;
+        var was_scope = false;
         if (node instanceof AST_Scope) {
-            //node.drop_unused(this);
             node = node.hoist_declarations(this);
+            was_scope = true;
         }
         descend(node, this);
         node = node.optimize(this);
-        if (node instanceof AST_Scope) {
+        if (was_scope && node instanceof AST_Scope) {
             node.drop_unused(this);
             descend(node, this);
         }